Fighting" is not a cheer, and "hand phone" is not a word.

Korean speakers often assume that Konglish terms like "fighting" and "hand phone" are understood by native English speakers, but they are not. "Fighting" sounds like an announcement of an imminent brawl, and "hand phone" is simply not a term used in any standard variety of English. If you use these in an email to an international client, you are not communicating—you are confusing them, and they will not ask you to clarify. Correct these once, and the confusion disappears permanently.